STAT 4020 Multivariate Analysis- Homework 1
1.3 The following are five measurements on the variables x1 ,x2 ,and x3 :
x1
x2
x3
9
12
3
2
8
4
6
6
0
5
4
2
8
10
1
find the arrays X̄, Sn ,and R
1.14 Table 1.6 contains some of the raw data discussed in Section 1.2 (See also the multiplesclerosis data on the web at www.prenhall.com/statistics.) Two different visual stimulijects
in the study groups. The values recorded in the table include x1 (subject’s age);x2 (total
response of both eyes to stimulus S1, that is S1L + S1R);x3 (difference between responses of
eyes to stimulus S1,| S1L − S1R |);and so forth.
(a) Plot the two-dimensional scatter diagram for the variables x2 and x4 for the multiplesclerosis group.Comment on the appearance of the diagram.
(b) Compute the (X̄),Sn , and R arrays for the non-multiple -sclerosis and multiplesclerosis groups separately.
1